Support for Downtimeless Upgrade/Update procedures
Benefits / Value:
Support that even for Updates it is suggested to stop Both Nodes of a clustered CSA environment.
We want to be able to Upgrade/Update the Portal and Controller clusters without downtime impact the enviroments.
There must be a described update path that allows Controllers in a certain version to Work with MPPs in a different version while upgrading/updating.
Controllers must be possible to upgrade/update one node while the other node is still running and serving customers in older Version.
Enterprise enviroment needs to be always up and running
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